I need a 460 for a boat I"m going to get, have one here in lubbock w/ like 90k or so on it that I can't hear run, and the guy wants $600 for it. said it didn't smoke or blah blah blah, but the carb got jacked so I can't fire it up. watching an auction on ebay but it's around the 100k mark too. so if you don't have one what's it cost to rebuild one? stroke it? possible within the $600 range?